ftp://ftp.cn.kernel.org/ubuntu/ubuntu/dists/  direct

[DIR]dapper/  direct  580+ twin directories
[DIR]dapper-security/  direct  99 twin directories
[DIR]dapper-backports/  direct  99 twin directories
[DIR]dapper-updates/  direct  100 twin directories
[DIR]gutsy-backports/  direct  100 twin directories
[DIR]gutsy-security/  direct  100 twin directories
[DIR]hardy/  direct  510+ twin directories
[DIR]hardy-backports/  direct  100 twin directories
[DIR]dapper-proposed/  direct  96 twin directories
[DIR]feisty/  direct  530+ twin directories
[DIR]hardy-proposed/  direct  96 twin directories
[DIR]hardy-security/  direct  102 twin directories
[DIR]intrepid/  direct  197 twin directories
[DIR]feisty-backports/  direct  95 twin directories
[DIR]gutsy/  direct  520+ twin directories
[DIR]hardy-updates/  direct  100 twin directories
[DIR]feisty-proposed/  direct  92 twin directories
[DIR]feisty-security/  direct  95 twin directories
[DIR]feisty-updates/  direct  95 twin directories
[DIR]gutsy-proposed/  direct  96 twin directories
[DIR]gutsy-updates/  direct  100 twin directories
[DIR]intrepid-updates/  direct  91 twin directories
[DIR]intrepid-backports/  direct  91 twin directories
[DIR]intrepid-security/  direct  91 twin directories
[DIR]intrepid-proposed/  direct  89 twin directories